Workshop-grade guides for 121 diesel diagnostic trouble codes — what each code means, injector-related and other causes, how mechanics diagnose it, and realistic UK repair costs.
Injector Problems & Symptoms
Diagnose by symptom — knocking, smoke, misfires
Diesel Engines We Cover
Injector guides by engine code
Knowledge Centre — Fault Codes
Workshop-depth fault code explainers
UK-tested remanufactured injectors with 12-month warranty. Search by part number, engine code or vehicle registration.
The codes are standard SAE J2012 / OBD-II definitions, but every guide here is written for diesel common-rail systems — injector-related causes, leak-off testing, rail pressure diagnosis and realistic UK repair costs.
No. Each guide separates injector-related causes from wiring, sensor, pump and ECU causes, and explains how mechanics isolate the true fault before replacing parts.
Yes. The library expands continuously and our diesel specialists can help diagnose any injector-related code. Call 020 3355 6581 or use the part-number search to find your replacement injector.